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Find dates, numbers, currency and units in UI text that read differently in other locales

Date and number format reviewFreeFor writers, developers and product teams

25/day

free runs a day, no sign-in.

Before: what you give it

The example input, as typed in. You paste text, CSS, markup or notes.

text: Order placed 04/05/2026 at 3:30pm. Ships Mar 4th. Total $1,234.56 (that is 1.234,56 in Berlin). 3 item(s) ago. Distance 12 miles, 50 %.
locales: en-US, de-DE, ja-JP, ar-EG
currency: EUR

After: what comes back

The first lines of a real run on that input. Nothing here is edited by hand.

DATE AND NUMBER FORMAT REVIEW
Scanned 135 characters of UI text.
Findings: 2 high, 4 medium, 2 low, 1 info

[HIGH] Date format (convention; ISO 8601 for interchange): 1 ambiguous numeric date
  4/5/2026 is 4 May in most of the world and April 5 in the US. Readers cannot tell which.
  Seen in: 04/05/2026
  Fix: Spell the month (5 May 2026) or format by the reader's locale with Intl.DateTimeFormat; use ISO 8601 (2026-05-04) for machine-facing text.

[HIGH] Number format: Mixed digit-grouping styles in one text
  Found 1,234.56 and 1.234,56. Readers cannot tell 1,234 (one thousand) from 1,234 (one point two three four).
  Seen in: 1,234.56 | 1.234,56
  Fix: Pick one per locale via Intl.NumberFormat.
... full output on the tool page

What you get

Findings by severity plus a table of one date, number and amount formatted for each locale you list

What it cannot do

Pattern-based on text you paste; the locale table uses the runtime's formatting data.

Who it is for

  • Writers
  • Developers
  • Product teams

Free and Pro

Free25 runs a day per IP address, up to 100,000 characters a run.
ProNo daily limit, 300 requests a minute, up to 200,000 characters a run.

What each plan includes

Use it from your assistant

The tool is called review_date_number_formats. Connect the server once, then ask for it by name or just describe the job. Install steps for each app.

claude mcp add --transport http designers https://designers.allthepossibles.com/mcp
curl -X POST https://designers.allthepossibles.com/api/date-number-format -H 'content-type: application/json' -d '{"text":"Order placed 04/05/2026 at 3:30pm. Ships Mar 4th. Total $1,234.56 (that is 1.234,56 in Berlin). 3 item(s) ago. Distance 12 miles, 50 %.","locales":"en-US, de-DE, ja-JP, ar-EG","currency":"EUR"}'

Try it here

The form starts with the same example input, so you can run it first and then swap in your own.

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